Shanglun Fm
Type Locality and Naming
The type section is located at Shanglun Village, 10 km east of Miaohuang Town of Xiangzhou County, Guangxi. It was named by Liu Jinrong Zhile in 1978 and placed in the lower part of Yujiang Stage. Yu C.M. et al. assigned it as a member to the lower Ertang Fm.
Synonym: Shanglun Dolomite
Lithology and Thickness
Dolomite. The Shanglun Formation consists mainly of gray to dark-gray medium- to thick-bedded dolomite intercalated with a few clayey limestone beds. In the type area, the Formation is about 185 m thick.
[Figure - Outcrop of Shanglun Dolomite in the Shuanggui Village of Ertang Town.]
Relationships and Distribution
Lower contact
The lower boundary is conformable contact with underlying Yujiang Fm at the appearance of dolostone.
Upper contact
It is conformably overlain by the Ertang Fm.
Regional extent
It is mainly distributed in the west side of Dayaoshan Mt. It is correlated with a partial Huangjingshan Fm Dolomite of Beiliu and Najiao Fm Dolomite of Liujing, Hengxian. The thickness decreases from south to north and dies out to the north of Dale.
GeoJSON
Fossils
The Shanglun Formation has poor fossils. Some fragments of small sized spiriferids and corals have been found.
Age
Depositional setting
It is interpreted as a restricted platform environment.
Additional Information